1// Copyright (c) 2008, Google Inc.
2// All rights reserved.
3//
4// Redistribution and use in source and binary forms, with or without
5// modification, are permitted provided that the following conditions are
6// met:
7//
8//     * Redistributions of source code must retain the above copyright
9// notice, this list of conditions and the following disclaimer.
10//     * Redistributions in binary form must reproduce the above
11// copyright notice, this list of conditions and the following disclaimer
12// in the documentation and/or other materials provided with the
13// distribution.
14//     * Neither the name of Google Inc. nor the names of its
15// contributors may be used to endorse or promote products derived from
16// this software without specific prior written permission.
17//
18// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
19// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
20// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
21// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
22// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
23// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
24// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
25// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
26// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
27// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
28// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
29
30// ---
31// Author: sanjay@google.com (Sanjay Ghemawat)
32
33#include <config.h>
34#include <stdarg.h>
35#include <stdio.h>
36#include "raw_printer.h"
37#include "base/logging.h"
38
39namespace base {
40
41RawPrinter::RawPrinter(char* buf, int length)
42    : base_(buf),
43      ptr_(buf),
44      limit_(buf + length - 1) {
45  RAW_DCHECK(length > 0, "");
46  *ptr_ = '\0';
47  *limit_ = '\0';
48}
49
50void RawPrinter::Printf(const char* format, ...) {
51  if (limit_ > ptr_) {
52    va_list ap;
53    va_start(ap, format);
54    int avail = limit_ - ptr_;
55    // We pass avail+1 to vsnprintf() since that routine needs room
56    // to store the trailing \0.
57    const int r = perftools_vsnprintf(ptr_, avail+1, format, ap);
58    va_end(ap);
59    if (r < 0) {
60      // Perhaps an old glibc that returns -1 on truncation?
61      ptr_ = limit_;
62    } else if (r > avail) {
63      // Truncation
64      ptr_ = limit_;
65    } else {
66      ptr_ += r;
67    }
68  }
69}
70
71}
72